Web Reference: Jul 23, 2025 · To define a custom exception in Python, you need to create a new class that inherits from the built-in Exception class or one of its subclasses. Here’s a basic example: How do I declare custom exception classes in modern Python? My primary goal is to follow whatever standard other exception classes have, so that (for instance) any extra string I include in the exception is printed out by whatever tool caught the exception. In Python, we can define custom exceptions by creating a new class that is derived from the built-in Exceptionclass. Here's the syntax to define custom exceptions, Here, CustomError is a user-defined error which inherits from the Exceptionclass.
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